/Engine/Plugins/Online/OnlineSubsystem/Source/Public/OnlineSubsystem.h
Public references to the online subsystem pointer should use this
typedef [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IOnlineSubsystem](API\Plugins\OnlineSubsystem\IOnlineSubsystem), ESPMode::ThreadSafe > IOnlineSubsystemPtr